The Starrett 5004BZ-16/400 electronic depth gauge has a measurement range of 0 to 16" (0 to 400mm), and a resolution (or smallest graduation interval) of 0.0005" (0.01mm). The LCD screen displays in U.S./metric and Mode and Set buttons control On/Off, Absolute/ Relative display, Inch/Metric display, Preset and Hold functions. The gauge is made of hardened steel for durability and accurate measurements. It has an RS232 data transmission port, includes a PT06136 offset attachment, and comes in a fitted case. This electronic depth micrometer is suitable for precise measurement in a variety of manufacturing, machining, and mechanical engineering applications.

Depth gauges are precision measuring instruments used to determine the depth of any shape that has a step, groove, or slot. These gauges often take the form of sliders that travel on a measuring beam or rods, are moved to position by hand, and then adjusted with a calibrated screw. The base of the gauge rests at the top of the shape whose recession is to be measured, while the beam or rods extend to the bottom of the recession to determine the measurement. Gauge position is read from a graduated scale, dial, counters, or an electronic display.

The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment, and saw blade products. The company, founded in 1880, is headquartered in Athol, MA.